2和5的倍数的特征1市公开课一等奖省赛课微课金奖课件.pptx

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,2,和,5,倍数特征,1/20,复习,怎样找一个数倍数？,从小到大写出,2,倍数（,10,个）：,写出,5,倍数（,6,个）,2,，,4,，,6,，,8,，,10,，,12,，,14,，,16,，,18,，,20,5,，,10,，,15,，,20,，,25,，,30,2/20,43467897654332,87654445667,8876654450,3/20,2,倍数特征,座位号是多少同学,应该从双号入口进,?,4/20,座位号为,2,，,4,，,6,，,8,，,10,，,2=1,2,4=2,2,6=3,2,8=4,2,10=5,2,这些数都是,2,倍数。,5/20,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,2,倍数,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,6/20,个位上是：,自然数中，是,2,倍数数叫做,偶数,(,0,也是偶数,),，不是,2,倍数数叫做,奇（,j,),数,。,0,，,2,，,4,，,6,，,8,你发觉,2,倍数有什么特征吗,?,数都是,2,倍数。,7/20,以下数中，哪些是奇数，哪些是偶数,?,33,98,355,988,0,123,3678,8089,1000,655,5656,881,奇数,偶数,8/20,最小偶数是几？有没有最大偶数？,最小奇数是几？有没有最大奇数？,最小偶数是,0,，没有最大偶数。,最小奇数是,1,，没有最大奇数。,考 考 你,9/20,5,倍数特征,5,倍数 又有什么特征呢？,10/20,在下表中找出,5,倍数，并涂上颜色。看看有什么规律。,书本,18,页,11/20,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,个位上是,_,或,_,数，是,5,倍数。,0,5,12/20,2,倍数,5,倍数,既是,2,倍数,又是,5,倍数,24,90,60,106,130,280,35,90,15,60,75,130,280,90,60,130,280,下面哪些数是,2,倍数,?,哪些数是,5,倍数,?,哪些数既是,2,倍数也是,5,倍数,?,24,35,67,90,99,15,60,75,106,521,130,280,P18,13/20,做完这道题，你有什么收获,?,个位上是,0,数，既是,2,倍数，又是,5,倍数。,14/20,1,、一个自然数不是奇数就是偶数（）,3,、同时是,2,、,5,倍数个位上数,字一定是,0,（）,我是小法官,2,、,10,是倍数，,5,是因数（）,15/20,19,36,104,48,65,287,78,153,找出,2,倍数。,104,36,48,78,16/20,个位是（）数同时是,2,和,5,倍数。,用,0,、,5,、,6,三个数字组成,2,倍数；,5,倍数；同时是,2,和,5,倍数。,0,2,倍数,5,倍数,560,650,605,506,560,650,既是,2,倍数也是,5,倍数,我会填,17/20,摸出几能够和“,5”,组成,2,倍数,?,摸出几能够和“,5”,组成,5,倍数,口袋里有,09,数字卡片,数学游戏,摸出,0,、,2,、,4,、,6,、,8,能够和“,5”,组成,2,倍数。,摸出,1,、,2,、,3,、,4,、,5,、,6,、,7,、,8,、,9,、,0,能够和“,5”,组成,5,倍数。,18/20,全课小结,2,倍数特征：个位上是,0,、,2,、,4,、,6,、,8,数，都是,2,倍数。（也就是能被,2,整除数）,5,倍数特征：个位上是,0,或,5,数，都是,5,倍数。（也就是能被,5,整除数）,2,和,5,共同倍数特征：个位上是,0,数，是,2,和,5,倍数。（也就是同时能被,2,和,5,整除数）,19/20,严谨认真,天天进步,休息,休息一会,20/20,